Window-blind fitting



Jan. '19 1926. 1,570,573

c. NEVATT WINDOW BLIND FITTING Filed Jan. 12 1924 I Shets-Sheet 1 7 n @Nfl Us 14/4 10 Jan. 19 1926. 1,570,573

v C. NEVATT NINDOW BLIND FITTING Filed Jan. 12, 1924 2 Sheets-Sheet 2 Patented Jan. 19, 1926.

UNITED STATES CHARLES NEVATT, OF GLASGOvV, SCOTLAND.

WINDOW-BLIND FITTING.

Application filed January 12, 1924. Serial No. 685,894.

To all whom it may concerns Be it known that I, Unsunns NEVAT'J, 23 Darnley (.lardens, Pollokshields, Glasgow, Scotland, a subject of the King of Great Britain, have invented certain new and useful Improvements Relating to VVindow- Blind Fittings, of which the following is a ter stated such that the blind proper will, in

movement of the blind roller and therefore accidental displacement of the same from its bearings; and fourth, to provide a roller blind the parts of which can be quickly and easily. erected, dismantled or renewed as and when required without requiring any special skill.

I attain these objects by the mechanism illustrated in the accompanying drawing, in which i Fig. l is an elevation of the blind roller and end journals; Fig. 2 an elevation of the complete blind fitted in position; Fig. 3 a section on the line 3-3 of Fig. 2; Fig. 4: an end View of a bearing bracket for one of the roller journals; and Fig. 5 a face view of the bearing bracket for the other roller journal.

Similar numerals refer to similar parts throughout the several views. v

The blind roller 7 (Figs. 1 and 2) is of the type known as a split blind roller, in other words it has a longitudinal recess 8 in which one end of the blind 9 2) is de tachably secured by a-batten or the like (not shown). Each end journal 10 of the roller has a flange or collar 11, engaging the proximate end of the roller and an Lshaped bracket 12 secure-d to said flange or collar. hen the end journal is in position the L- shaped racket fits simply in the aforesaid re ess 8 and is secured to t e roller by a screw 13 inserted throughan opening in one limb of the bracket. For convenience in attaching the screw the head thereof may be formed with a polygonal opening 14 adapted to receive the end of a polygonal screw driver. One end journal 10 receives a flange or collar 15 in order to form between it and the adjacent collar 11 a cord drum 16, and the other end journal 10 has loosely mounted thereon a ratchet wheel 17 which is frictionally clutched to the journal by spring washers 1'8, 18 bearing one at either side thereof. One of the spring washers is accommodated between the ratchet wheel and the adjacent flange or collar 11, and the other spring washer is accommodated between the ratchet wheel and a collar 19 securedon the outer end of the journal.

Two brackets 20, 21 of novel construction are provided to receive the end journals 10, 10 of the blind roller. In practice, these brackets are attached to the window frame 22 (Fig. 2) in any suitable manner, as by means of screws 23.

As will be seen from Figs. 2, 3 and 4 the bracket is channel shaped and on the outer limb 24: it carries an open jaw member 25 to receive that end journal 10 of the roller, which supports the ratchet wheel 17 whereas its other limb 26 projects forwardlyon one side of the ratchet wheel. A detent 27 is pivoted at 28 between the two limbs 24;, 26 and depends, into the path'of the ratchet wheel as the blind roller is rotated.

The other bracket 21 (Figs. 2 and 5) has flanges 29, 29 bent up one at each side of the bearing 30 for the end journal 10 carrying the cord drum 16, said flanges being so, located as to overlap the collar 15 of said drum and being shaped to provide inclined guides for the blind cord 31.

Assuming the parts constituting the blind fitting have been assembled and that the complete blind has been erected in place then the operation is briefly as follows When the blind is pulled down, the roller 7 is rotated but the ratchet wheel 17 is retained by reason of the detent 27 (which is forced into engagement with the jaw member 25) and, at the same time, the cord 31 winds itself on the cord drum 16. If, now,

the cord 31 is pulled, the blind roller 7 is rowhich comes into action immediately the cord is released to prevent the blind unwinding again of its own accord.

\Vith certain roller blinds of the general character to which my invention belongs the blind cannot be equally spaced from either side of the window, owing to the drum for the operating cord being disposed between the aforesaid ratchet wheel and the adjacent end of the blind roller, whereby the litting at that end ot the roller is wider than the fitting at the other end. This disadvantage is eliminated by arranging the cord drum 16 at the end of the blind roller 7 remote from. the ratchet wheel 17 thus providing end fittings of :substantially equal width. as will be apparent from Fig. 2.

By providing the flanges 29 on the bracket 21 so that they overlap the cord drum flange or collar 15, the cord 31 is guided automatically back on to the drum 16 should it tend to free itself therefrom for any reason.

The limb 26 ot the other bracket 20, prevents axial movement of the blind roller by engaging the ratchet wheel 17 and thereby prevents accidental displacement of the roller from its bearings. Oi"? course, the roller can be instantly detached by first raising the left hand end journal 10 Fig. 2 from the jaw member 25 and then moving the roller bodily to the left to free the other end journal 10 from the bearing in the bracket 21.

It will be apparent that the parts constituting the roller blind can be easily assembled and dismantled as and when required with a minimum of time and trouble and that the whole provides a simple roller blind fitting which is not liable to get out of order.

The pivot pin 28 for the detent 27 is supported at both ends in openings in the limbs 24, 26 and for that reason cannot be bent or 'displacet during the operation of the blind.

Many modifications may be made without in any way departing from the scope of the invention; for example a single soring washer 18 may be used for the ratchet wheel l7 but I find that when two such washers are employed as herein described and illustrated a more durable arrangement is obtained combined with a more even action of the blind and blind roller. Further, the detent 27 and the ratchet wheel 17 may be reversed if it is preferred that the blind shall unwind itself on the other side of the roller to that shown in Fig. 2, and the. pivot pin 28 is located to suit either position of the detent.

Having now fully described my invention what I claim and desire to secure by Letters Patent is 2-- 1. A blind roller, journals having discs to bear against the end of the roller having flanges to embrace the peripheral surface thereof adjacent the ends, L-shaped brackets having their outstanding portions secured to the discs within the plane of the flange and their lateral portions seated in recesses formed in the roller and of a depth materially exceeding the thickness of such lateral portions, a securing means passed through the lateral portions of the brackets and engaging the roller, a ratchet wheel loosely arranged upon one of the journals, springs carried by the journal engaging the ratchet wheel on opposite sides thereof, the other journal being enlarged to provide a cord drum.

2. In combination with a drum carrying journal of a blind roller, a bearing bracket having integral front and rear flanges with curved free edges to overlie the drum and form inclined guides to cause the cord to wind upon the drum.

In combination with a journal of a blind roller formed in part to provide a cord drum and beyond the cord drum toform a bearing spindle, a bracket to receive and support said bearing spindle, and guide members formed on the bracket on opposite sides of the spindle to project toward and overlie the adjacent end of? the cord drum, whereby to cause the cord to wind upon the drum in operation.

4. In combination with a journal cl" a blind roller formed in part to provide a cord drum and reduced beyond the cord drum to form a spindle, a collar arranged upon the journal at (.he'end of and having a diameter exceeding that of the cord drum, a bracket to receive and revolubly support the spindle, and flanges projecting inwardly from the bracket to overlie the edges of the collar and project inwardly beyond the outer end of the cord drum, the operative edges of the flanges being curved, whereby to cause the cord to wind upon the drum and prevent it from winding upon the spindle.

In testimony whereof I atlix my signature.

CHARLES NEVATT. 

